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ND66-GK725 (IEC1500V) vs ND54-GR490 4 of 18 identical Swap Change panels

TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND54-GR490

TCL Zhonghuan
HSM-ND66-GK725 (IEC1500V)
725 Wp 23.30 % TOPCon Bifacial Incomplete
Open panel page Datasheet PDF
VS
TCL Zhonghuan
HSM-ND54-GR490
490 Wp 22.00 % TOPCon Bifacial
Open panel page Datasheet PDF
The verdict

ND66-GK725 (IEC1500V) leads on the differences that matter

The largest is module efficiency: 1.30 pp more efficient. 4 of 18 comparable parameters are identical, with 1 more left out because at least one datasheet does not publish it.

See all 14 differences
How alike are they
4 of 18 comparable
parameters are identical
identical differs not published
01

What actually differs

14 of 18 parameters
Parameter ND66-GK725 (IEC1500V) ND54-GR490 Difference
Module efficiency 23.30 % 22.00 % 1.30 pp more efficient
Rated power 725 Wp 490 Wp 235 W more power
Power density 233.4 Wp/m² 220.3 Wp/m² 13.0 Wp/m² higher
Weight 38.2 kg 27.0 kg 11.2 kg lighter
Product warranty 15 yrs 25 yrs 10 yrs longer
Open-circuit voltage 49.36 V 39.50 V 9.86 V apart
Short-circuit current 18.60 A 15.67 A 2.93 A apart
Module area 3.106 m² 2.224 m² 0.883 m² apart
Temperature coefficient -0.280 %/°C -0.290 %/°C 0.010 %/°C better in heat
Voltage at max power 41.27 V 33.30 V 7.97 V apart
Current at max power 17.57 A 14.72 A 2.85 A apart
Cell count 132 108 24 cells apart
Weight per kWp 52.7 kg/kWp 55.1 kg/kWp 2.4 kg/kWp lighter
Dimensions 2384x1303x33 mm 1961x1134x30 mm 2384x1303x33 mm vs 1961x1134x30 mm
02

What it means on a roof

Thirty years of production
Declared first-year losses, with 0.40% a year afterwards assumed for both panels, at 1,200 kWh/kWp a year
ND66-GK725 (IEC1500V)
24,325 kWh
ND54-GR490
16,440 kWh
Lifetime gap
7,885 kWh
Output when it is hot
Rated power carried across the range a module actually sees
Scenario ND66-GK725 (IEC1500V) ND54-GR490
Standard test conditions 25 °C 100.0% of rated power 725 W 490 W
Cool, bright day 40 °C 95.7% of rated power 695 W 469 W
Typical summer roof 55 °C 91.3% of rated power 664 W 447 W
Hot roof 70 °C 87.0% of rated power 634 W 426 W
03

Full specification

Parameter ND66-GK725 (IEC1500V) ND54-GR490 Difference
Power and efficiency
Rated power 725 Wp 490 Wp +235 W for ND66-GK725 (IEC1500V)
Module efficiency 23.30 % 22.00 % +1.30 pp for ND66-GK725 (IEC1500V)
Power density 233.4 Wp/m² 220.3 Wp/m² +13.0 Wp/m² for ND66-GK725 (IEC1500V)
Open-circuit voltage 49.36 V 39.50 V 9.86 V apart
Voltage at max power 41.27 V 33.30 V 7.97 V apart
Short-circuit current 18.60 A 15.67 A 2.93 A apart
Current at max power 17.57 A 14.72 A 2.85 A apart
Temperature
Temperature coefficient -0.280 %/°C -0.290 %/°C +0.010 %/°C for ND66-GK725 (IEC1500V)
Mechanical
Dimensions 2384x1303x33 mm 1961x1134x30 mm 2384x1303x33 mm vs 1961x1134x30 mm
Module area 3.106 m² 2.224 m² 0.883 m² apart
Weight 38.2 kg 27.0 kg -11.2 kg for ND54-GR490
Weight per kWp 52.7 kg/kWp 55.1 kg/kWp -2.4 kg/kWp for ND66-GK725 (IEC1500V)
Warranty and degradation
Product warranty 15 yrs 25 yrs +10 yrs for ND54-GR490
Performance warranty 30 yrs 30 yrs Same
Annual degradation - 0.40 %/yr Not published by TCL Zhonghuan
Technology
Cell technology TOPCon TOPCon Same
Cell type Monocrystalline Monocrystalline Same
Cell count 132 108 24 cells apart
Bifacial Yes Yes Same
04

Against the whole database

14,005 panels
Efficiency
#1,017 vs #6,517
ND66-GK725 (IEC1500V) leads by 5,500 places
Power density
#936 vs #6,276
ND66-GK725 (IEC1500V) leads by 5,340 places
Heat behaviour
#1,309 vs #2,165
ND66-GK725 (IEC1500V) leads by 856 places
Weight
#6,337 vs #9,526
ND66-GK725 (IEC1500V) leads by 3,189 places
Warranty
#21 vs #21
Tied - the same position in the database
Overall
#266 vs #5,434
ND66-GK725 (IEC1500V) leads by 5,168 places
05

More useful comparisons

Open the full database
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK725
One difference: cell technology
Same series, other bin
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TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720 (IEC1500V)
One difference: module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK720
One difference: cell technology
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715 (IEC1500V)
3 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK715
4 differences, the largest is module efficiency
Same series, other bin
TCL Zhonghuan
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) vs TCL Zhonghuan HSM-ND66-GK710
4 differences, the largest is module efficiency
06

Written summary

07

Questions about this pairing

Which panel is better: TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) or TCL Zhonghuan HSM-ND54-GR490?
According to our database: TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has higher module efficiency (23.30% vs 22.00%); TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) tolerates heat better (temp coeff -0.280%/°C vs -0.290%/°C). See the full spec comparison and 30-year energy simulation above for a complete picture.
What is the efficiency of TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) and TCL Zhonghuan HSM-ND54-GR490?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has a module efficiency of 23.30%, while TCL Zhonghuan HSM-ND54-GR490 is 22.00%. Higher efficiency means more electricity from the same roof area - useful when space is limited.
What cell technology does TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) use vs TCL Zhonghuan HSM-ND54-GR490?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) uses TOPCon cells; TCL Zhonghuan HSM-ND54-GR490 uses TOPCon. Modern n-type technologies (TOPCon, HJT, BC) typically deliver higher efficiency and lower degradation compared to older PERC (p-type) cells.
What is the warranty on TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) and TCL Zhonghuan HSM-ND54-GR490?
TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) has a 30 years power warranty; TCL Zhonghuan HSM-ND54-GR490 has a 30 years power warranty. The power warranty guarantees a minimum percentage of rated output at the end of the warranty period (typically 80-87%). Product (materials) warranties are usually shorter.
Are TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) and TCL Zhonghuan HSM-ND54-GR490 bifacial panels?
Both TCL Zhonghuan HSM-ND66-GK725 (IEC1500V) and TCL Zhonghuan HSM-ND54-GR490 are bifacial - they capture reflected light from the ground, which can add 5-15% more annual energy on ground-mount or elevated rooftop installations with a light surface beneath.

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Every figure here is from the manufacturers' own datasheets - a dash means the value is not published, never an estimate. The thirty-year projection and the temperature scenarios are calculations from those figures, and each states its assumption above.